Load all of the sounds into iTunes (simply drag and drop in most operating systems) then choose iTunes > PreferencesClick on the \'General\' tab, then click on the \'Import Settings\' button and choose \'MP3 Encoder\'. You can also choose the quality setting you want or choose \'custom\' if you have a specific setting in mind.Click OK. Then go back to the library, select all of your tracks that you want to convert, then choose Advanced > Create MP3 Version.Once that is done you will have an MP3 version of the track in your iTunes music folder.